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Simona D'Agostino, Chiara Della Monica, Eleonora Palizzi, Fabio Di Pietrantonio, Massimiliano Benetti, Domenico Cannatà, Marta Cavagnaro, Dariush Sardari, Pasquale Stano, Alfonsina Ramundo-Orlando
Among the many biological effects caused by low intensity extremely high frequency electromagnetic fields (EHF-EMF) reported in the literature, those on the nervous system are a promising area for further research. The mechanisms by which these fields alter neural activity are still unclear and thus far there appears to be no frequency dependence regarding neuronal responses. Therefore, proper in vitro models for preliminary screening studies of the interaction between neural cells with EMF are needed. We designed an artificial axon model consisting of a series of parallel RC networks...
June 18, 2018: Scientific Reports
Yong Ma, Jiarui Zhao, Yifei Li, Dazhang Li, Liming Chen, Jianxun Liu, Stephen J D Dann, Yanyun Ma, Xiaohu Yang, Zheyi Ge, Zhengming Sheng, Jie Zhang
Compact acceleration of a tightly collimated relativistic electron beam with high charge from a laser-plasma interaction has many unique applications. However, currently the well-known schemes, including laser wakefield acceleration from gases and vacuum laser acceleration from solids, often produce electron beams either with low charge or with large divergence angles. In this work, we report the generation of highly collimated electron beams with a divergence angle of a few degrees, nonthermal spectra peaked at the megaelectronvolt level, and extremely high charge (∼100 nC) via a powerful subpicosecond laser pulse interacting with a solid target in grazing incidence...
June 18, 2018: Proceedings of the National Academy of Sciences of the United States of America
David Ebaugh, Travis Pollen, Jason Mohring, Kelly Gerrity, Noel Goodstadt, Margaret Finley
BACKGROUND: Individuals with short resting pectoralis minor muscle length have been shown to have aberrant scapulothoracic motion when compared to individuals with long resting pectoralis minor muscle length. However, the degree to which the pectoralis minor muscle can be lengthened and whether or not scapulothoracic motion differs between individuals with short and typical resting pectoralis minor muscle length is unknown. OBJECTIVES: To determine if: (1) pectoralis minor muscle elongation (percent pectoralis minor muscle can be actively and passively lengthened beyond resting length), (2) pectoralis minor muscle percent length change during overhead reaching, and (3) scapulothoracic motion during overhead reaching differ between individuals with short and typical resting pectoralis minor muscle length...
June 6, 2018: Brazilian Journal of Physical Therapy
Zhichao Lou, Yao Zhang, Ming Zhou, He Han, Jiabin Cai, Lintian Yang, Chenglong Yuan, Yanjun Li
With the rapid growth in the use of wireless electronic devices, society urgently needs electromagnetic wave (EMW) absorbing material with light weight, thin thickness, wide effective absorbing band width, and strong absorption capacity. Herein, the multi-layer magnetic composite boards are fabricated by hot-pressing magnetic fiber boards and normal veneer layer-by-layer. The magnetic fibers obtained using in-situ chemical co-precipitation are used to fabricate magnetic fiber board by hot-pressing. The magnetic wave absorbing capacities of the magnetic fiber boards obtained with 72 h impregnation time exhibit strongest adsorption capacities of −51...
June 16, 2018: Nanomaterials
Wendong Wang, Chaohong Liang, Peng Zhang, Yikai Shi
OBJECTIVE: A portable back massage robot which can complete the massage operations such as tapping, kneading and rolling was designed to improve the level of intelligence and massage effect. An efficient full covered path planning algorithm was put forward for a portable back massage robot to improve the coverage. BACKGROUND: Currently, massage robots has become one of important research focuses with the increasing requirements for healthcare. The massage robot is difficult to be widely accepted as there are problems of massage robot in control, structure, and coverage path planning...
May 30, 2018: Technology and Health Care: Official Journal of the European Society for Engineering and Medicine
Marie Thi Dao Tran, Sine Skovbjerg, Lars Arendt-Nielsen, Per Bech, Marianne Lunde, Jesper Elberling
Background Multiple chemical sensitivity (MCS) is a chronic, disabling condition characterized by recurrent multisystem symptoms triggered by common airborne chemicals. Evidence points towards abnormal sensory processing in the central nervous system (CNS) as a likely pathophysiological mechanism. No effective treatment has yet been reported, but clinical observations suggest that as pulsed electromagnetic fields (PEMF) is a treatment for some CNS disorders (depression and chronic pain), it may also be a treatment modality for MCS...
December 29, 2017: Scandinavian Journal of Pain
Ali Masoumi, Narges Karbalaei, S M J Mortazavi, Mohammad Shabani
PURPOSE: There is a great concern regarding the possible adverse effects of electromagnetic radiation (EMR). This study investigated the effects of EMR induced by Wi-Fi (2.45GHz) on insulin secretion and antioxidant redox systems in the rat pancreas. MATERIALS AND METHODS: Adult male Sprague-Dawley rats in the weight range of 230 to 260 g were divided into control, sham, Wi-Fi exposed groups. After long term exposure (4 h/day for 45 days) to Wi-Fi electromagnetic radiation, plasma levels of glucose and insulin during intraperitoneal glucose tolerance test were measured...
June 18, 2018: International Journal of Radiation Biology
Danqing Wang, Marc R Bourgeois, Won-Kyu Lee, Ran Li, Dhara Trivedi, Michael P Knudson, Weijia Wang, George C Schatz, Teri W Odom
This paper reports a robust and stretchable nanolaser platform that can preserve its high mode quality by exploiting hybrid quadrupole plasmons as an optical feedback mechanism. Increasing the size of metal nanoparticles in an array can introduce ultrasharp lattice plasmon resonances with out-of-plane charge oscillations that are tolerant to lateral strain. By patterning these nanoparticles onto an elastomeric slab surrounded by liquid gain, we realized reversible, tunable nanolasing with high strain sensitivity and no hysteresis...
June 18, 2018: Nano Letters
Parth Nalin Vakil, David A Hardy, Geoffrey F Strouse
As the importance of anisotropic nanostructures and their unique surfaces continues to rise in applications including catalysis, magneto-optics and electromagnetic interference shielding, there is a need for efficient and economical synthesis routes for such nanostructures. The manuscript describes the application of cycled microwave-based heating for the rapid synthesis of highly branched pure phase fcc crystalline nickel mulitpods nanostructures with >99% multipod population. By controlling the power delivery to the reaction mixture through cycling, superior control is achieved over the growth kinetics of the metallic nanostructures allowing formation of multipods consisting of arms with different aspect ratios...
June 18, 2018: ACS Nano
Sumru Keceli, Stefan Stenfelt
OBJECTIVE: To compare recordings of bone conduction (BC) stimulated auditory brainstem response (ABR) obtained using the newer BC transducer Radioear B81 and the conventional BC transducer Radioear B71. Balanced electromagnetic separation transducer (BEST) design found in the B81 may influence the ABR magnitudes and latencies, as well as electrical artefacts. DESIGN: ABRs to tone burst stimuli of 500 Hz, 2000 Hz, 4000 Hz, click stimulation, and broad-band chirp stimulation at 20 and 50 dB nHL were recorded...
June 18, 2018: International Journal of Audiology
Aidan Rafferty, Thomas C Preston
A quantitative understanding of light scattering by small homogeneous particles requires accurate knowledge of particle geometry and complex refractive index, m = n + ik. In weakly absorbing particles, k can be on the order of 10-9, which is well below the detection limit of almost all light scattering based instruments. Here, we describe a dual-beam optical trap that can simultaneously determine n, k, and the radius, s, of weakly absorbing aerosol particles. We utilize cavity-enhanced Raman scattering to determine n and s and electromagnetic heating from the trapping laser itself to determine k...
June 18, 2018: Physical Chemistry Chemical Physics: PCCP
Baskaran Ganesh Kumar, Rustamzhon Melikov, Mohammad Mohammadi Aria, Aybike Ural Yalcin, Efe Begar, Sadra Sadeghi, Kaan Guven, Sedat Nizamoglu
Lithography, the transfer of patterns to a film or substrate, is the basis by which many modern technological devices and components are produced. However, established lithographic approaches generally use complex techniques, expensive equipment, and advanced materials. Here, we introduce a water-based microcontact printing method using silk that is simple, inexpensive, ecofriendly, and recyclable. Whereas the traditional microcontact printing technique facilitates only negative lithography, the synergetic interaction of the silk, water, and common chemicals in our technique enables both positive and negative patterning using a single stamp...
April 9, 2018: ACS Biomaterials Science & Engineering
Rui Tang, Longfei Ma, Ang Li, Lihan Yu, Zhixia Rong, Xinjing Zhang, Canhong Xiang, Hongen Liao, Jiahong Dong
BACKGROUND: We applied augmented reality (AR) techniques to flexible choledochoscopy examinations. METHODS: Enhanced computed tomography data of a patient with intrahepatic and extrahepatic biliary duct dilatation were collected to generate a hollow, 3-dimensional (3D) model of the biliary tree by 3D printing. The 3D printed model was placed in an opaque box. An electromagnetic (EM) sensor was internally installed in the choledochoscope instrument channel for tracking its movements through the passages of the 3D printed model, and an AR navigation platform was built using image overlay display...
June 1, 2018: Surgical Innovation
Shengping Wen, Yu Su, Rong Wu, Shiwei Zhou, Qianhao Min, Gao-Chao Fan, Li-Ping Jiang, Rong-Bin Song, Jun-Jie Zhu
The accurate therapeutic evaluation for chronic myeloid leukemia (CML) drug is of great importance to minimize side effects and enhance efficacy. Herein, a facile and precise surface-enhanced scattering (SERS) approach based on coupled plasmonic field has been introduced to evaluate the therapeutic outcomes of antileukemia drug through ultrasensitive assay of caspase-3 activity in apoptotic cells. Caspase-3 as an apoptosis indicator could specifically cleave the N-terminus of biotinylated DEVD-peptide (biotin-Gly-Asp-Gly-Asp-Glu-Val-Asp-Gly-Cys) immobilized on the Au nanoparticle-decorated TiO2 nanotube arrays (TiO2 /Au NTAs) substrate...
June 2, 2018: Biosensors & Bioelectronics
Shaoyu Wu, Qiang Yu, Anli Lai, Jing Tian
Pulsed electromagnetic fields (PEMFs) are effective in healing fractures and improving osteoporosis. However, their effect on mesenchymal cells remains largely unknown. In this study, the effects of PEMF on osteoblastogenesis and its underlying molecular signaling mechanisms were systematically investigated in C3H10T1/2 cells. C3H10T1/2 mesenchymal cells were exposed to 30-Hz PEMF bursts at various intensities for 3 consecutive days. The optimal PEMF exposure (30 Hz, 1 mT, 2 h/day) was applied in subsequent experiments...
June 14, 2018: Biochemical and Biophysical Research Communications
David E Hintenlang, Xia Jiang, Kevin J Little
PURPOSE: To document a study in shielding a high-sensitivity digital mammography system detector from AC magnetic fields of magnitudes great enough to induce imaging artifacts. METHODS/MATERIALS: Preliminary evaluation of AC magnetic fields at a site designated for a digital breast tomosynthesis (DBT) system raised concerns that the magnetic component of electromagnetic interference (EMI) may be great enough to induce imaging artifacts. Subsequent measurements using digital detector arrays from two separate manufacturers verified this concern, and AC magnetic fields were mapped, spatially and temporally, throughout the area of concern...
June 15, 2018: Journal of Applied Clinical Medical Physics
Ravi Pant, Siva Shakthi A, Anjali B Yelikar
Wideband excitation and control of Fano resonance and electromagnetically induced transparency (EIT), both of which rely on coherent interaction between two excitation paths, is challenging. It requires precise control and tuning of interacting resonances or coupling between different resonant structures over a wide frequency range. Gain (Stokes) and absorption (anti-Stokes) resonances associated with the stimulated Brillouin scattering (SBS) process can be excited and controlled over a wide frequency range by tuning the pump frequency, its power and profile...
June 15, 2018: Scientific Reports
Elisabeth Steiner, Chun-Chien Shieh, Vincent Caillet, Jeremy Booth, Nicholas Hardcastle, Adam Briggs, Dasantha Jayamanne, Carol Haddad, Thomas Eade, Paul Keall
PURPOSE: Four-dimensional cone beam computed tomography (4DCBCT) facilitates verification of lung tumor motion before each treatment fraction and enables accurate patient setup in lung stereotactic ablative body radiation therapy. This work aims to quantify the real-time motion represented in 4DCBCT, depending on the reconstruction algorithm and the respiratory signal utilized for reconstruction. METHODS AND MATERIALS: Eight lung cancer patients were implanted with electromagnetic Calypso beacons in airways close to the tumor, enabling real-time motion measurements...
April 27, 2018: International Journal of Radiation Oncology, Biology, Physics
Yuan Shi, Jianyuan Xiao, Hong Qin, Nathaniel J Fisch
Real-time lattice quantum electrodynamics (QED) provides a unique tool for simulating plasmas in the strong-field regime, where collective plasma scales are not well separated from relativistic-quantum scales. As a toy model, we study scalar QED, which describes self-consistent interactions between charged bosons and electromagnetic fields. To solve this model on a computer, we first discretize the scalar-QED action on a lattice, in a way that respects geometric structures of exterior calculus and U(1)-gauge symmetry...
May 2018: Physical Review. E
Héctor O González Ochoa, Gualberto Solís Perales, Irving R Epstein, Ricardo Femat
We examine how stochastic time-delayed negative feedback affects the dynamical behavior of a model oscillatory reaction. We apply constant and stochastic time-delayed negative feedbacks to a point Field-Körös-Noyes photosensitive oscillator and compare their effects. Negative feedback is applied in the form of simulated inhibitory electromagnetic radiation with an intensity proportional to the concentration of oxidized light-sensitive catalyst in the oscillator. We first characterize the system under nondelayed inhibitory feedback; then we explore and compare the effects of constant (deterministic) versus stochastic time-delayed feedback...
May 2018: Physical Review. E
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